/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id: LangCall.java,v 1.2.4.1 2005/09/01 15:54:25 pvedula Exp $
 */

package com.sun.org.apache.xalan.internal.xsltc.compiler;

import java.util.Vector;

import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.ILOAD;
import com.sun.org.apache.bcel.internal.generic.INVOKESTATIC;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.FilterGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.StringType;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;

/**
 * @author Morten Jorgensen
 */
final class LangCall extends FunctionCall {

  private Expression _lang;
  private Type _langType;

  /**
   * Get the parameters passed to function:
   * lang(string)
   */
  public LangCall(QName fname, Vector arguments) {
    super(fname, arguments);
    _lang = argument(0);
  }

  /**
   *
   */
  public Type typeCheck(SymbolTable stable) throws TypeCheckError {
    _langType = _lang.typeCheck(stable);
    if (!(_langType instanceof StringType)) {
      _lang = new CastExpr(_lang, Type.String);
    }
    return Type.Boolean;
  }

  /**
   *
   */
  public Type getType() {
    return (Type.Boolean);
  }

  /**
   * This method is called when the constructor is compiled in
   * Stylesheet.compileConstructor() and not as the syntax tree is traversed.
   */
  public void translate(ClassGenerator classGen,
      MethodGenerator methodGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();

    final int tst = cpg.addMethodref(BASIS_LIBRARY_CLASS,
        "testLanguage",
        "(" + STRING_SIG + DOM_INTF_SIG + "I)Z");
    _lang.translate(classGen, methodGen);
    il.append(methodGen.loadDOM());
    if (classGen instanceof FilterGenerator) {
      il.append(new ILOAD(1));
    } else {
      il.append(methodGen.loadContextNode());
    }
    il.append(new INVOKESTATIC(tst));
  }
}
